What stops you lifting piece of lamb from cold store? (6,8)
I believe the answer is:
Here is my best explanation:
'what stops you lifting' is the definition.
'cold store?' is the subsidiary indication.
'cold' becomes 'frozen' ('frozen' is associated in meaning with 'cold').
'store?' becomes 'shoulder' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'piece of lamb from' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
(Other definitions for frozen shoulder that I've seen before include "could be a pain", "Getting alternative to fresh cut of meat", "Perhaps extreme indifference" and "making it difficult to take up arms?".)